Telephone-receiver shell.



J. HALL'DOW.

TELEPHONE RECEIVER SHELL. y APPLIOATION FILED 00T. AB, 1908.

' Patented Apr. 4,V 1911.

Invell Jahn Hal ld :1W

AIIUPTBS j IIIJIIISD STATESQPLTENT OFFICE.

JOHN HALLDO'W, or ELYRIA, omo, AssreNo'R To THE DEAN ELECTRIC COMPANY, or

ELYRIA, omo, A ooRroRA'rIoN or oHIo.

TELEPHONE-RECEIVER SHELL.

Specification of Letters Patent,

Patented Apr. 4, 1911.

Application Iled4 October 8, 1.908. Serial No. 456,688.

To all whom 'it may concern:

Be it known that I, JOHN H'Annnow, a citizen of the United States, residingJ at Elyria, in the county of Lorain and State of Ohio, have invented a certain nen1 and useful Improvement in Telephone-Receiver Shells, of which the` following is a full, clear, concise, and exact description, reference beingr had to the accompanying drawings, forming a part of this specification.

My invention relates to telephone receivcrs and has for its object. the construction of a receiver sh'ell of metal which shall accomplish all of :the purposes heretofore secured in connection with shells for such instruments, and having the additional advantage of lightness, durability, improved appeal'- ance and cheapness.

y Receiver shel-ls have commonly been made :heretofore of insulating material of one fornror another which, generally speaking,

is very'brittlc in nature and therefore easily broken. -To avoid this difficulty the shells have usually been constructed of consider-v able thickness with the result thatthey `are both clumsy and heavy. By my invention I construct these shells of thin. sheet metal and use in conjunction' therewith separate threaded rings, one adapted to be secured ta the body portion of the shell and the other to be secured to the receiver cap. The re :eiver cap may ybe constructed in one piece or it may be constructed in a manner similar '3o the. body portion of the shell. In my present invention I secure the. threaded rings to the parts of: the receiver shell in a very simple and leftective manner, which permits the shells to be manufactured very .-.liea-ply. This particular means for secur- 'ng the. threaded ringrsto the main port-ions )fthe receiver shell and cap forms the subiect matt-er of this invention and will be referred to in detail in connection with the irawings accompanying this specification. [f preferred, a cap of insulating material nay be used in. connect-ion with the metal shell instead of Vthe metallic cap above referred to.

In constructing my improved receiver ahell I make use preferably of forming dies :o for-xn sheet metal into the desired conformation'. In order to be readily manipir ated so as to assume the form required, the iheet metal used must `be 'preferably rela Lively thin. This thin material, however, is

not adapted to be threaded, since the threads would be so fine necessarily as to be of no use. Furthermore, the threaded portion would not possess sufficient rigidity to readily engage the cooperating threaded member. I eliminate this diliicully by using in conjunction with the thin metal forming the body portion of the shell a separate ring which is preferably of metal, although other material may be used if de'- sired, which is Secured to the body portion of the shell in a manner that Will'appear below. This ring serves to permit| the forming of threads of suitable size to be practical and also serves to reinforce vthe larger end 'of the shell. A further advantage secured by this construction is that the receiver shell is comparatively light. of forming the shell of material thick enough to be properly threaded, the shell would be so heavy las to practically Vprohibit its use. I,

A further advantage secured by, my improved'construction isA to be found in the casefn which the mailt. portion of both the shell proper and the cap are formed, for the .sake of cheapness, of thin sheet steel. The construction used, which is described above and forms the subject matter of this invention, permits the use of threaded rings of other material in corinection with the formed steel members, as a. result of which .the possibility of corrosion of the threads. engaging each other may be eliminated.4

If a. steel shell had formed directly thereon the threads for c.engagedng the cap, serious difficulty might result from the corrosion of the steel threads. and in many cases would make it practically impossible to remove the cap rom the receiver after the same had been in use for some time. This result Would occur particularly in the case in which both the receiver shell and the cap were made of steel, each having the threads carried thereby formed directly in the steel itself.

In connection with the use of sheet steel for forming the main portion of the shell proper and the cap I employ a protecting varnish or coating, as for example enamel or japan, tov thoroughly protect the steel from the. contact. of moisture. This means could not be used satisfactorily to protect the steel .screw threads above referred to,

since evidently the yscrew threads, in order M In the event taken through the receiver shell proper and the receiver cap, and shows the coperating mechanism contained within the shell. Figi..

2 shows in end view taken from the left -the receiver cap 6 and the screw ring 5,

as well as the means' used to secure the ring to the cap. Fig. 3 is an enlarged sectional view of a portion of the receiver shell and a portion of the receiver cap and shows the mgans employed for securing the threaded rings-to the shell and the cap.

Similar numerals refer to similar parts throughout the several views.

. As shown in the several drawings, the receiver shell 1 is of,tubular conformation having a slighttaper, as indicated, and is enlarged at its left-hand end to coperate with a threaded ring used to engage the receiver cap. The threaded ring 4 has formed therein a plurality of holes 4, as shown in Fig. 3, into which the body portion of the receiver shell is forced by means of a center punch or similar tool, as shown at 1. Theresult of this is that the ring 4, even though it may not-be a tight fit on the re.

ceiver shell, is prevented from being removed therefrom by the several projections 1 formed from the receiver shell 1 into the holes 4. When the screw threads formed on the outer surface of the ring 4 are engaged, .by the receiver cap, a shoulder 4b serves to communicate the stress exerted upon the. ring 4 to the body portion 1 of the receiver shell. The smaller end of the shell 1 has an enlarged annular portion 17 formed thereon, which is adapted to engage the receiver hook when the receiver is not in use. The material of the shell is continued around the smaller end and has an opening 15 formed in the end through which the conductor 16 is adapted to pass.l The edges of the opening 15 are formed inward, -as indicated, so that the sharp edges of the opening cannot come in contact with the conductor cord.

The coperating mechanism of the receiver is of the well-known type in which such mechanism is completely assembled independently of the receive;` casing. As shown in the drawings, it consists essentially of permanent magnets 9, 9 having secured to their left-hand ends a. metal cup 10. within which the receiver coils 1l, 11 are located. The outer edge ofthe cup 10 is threaded. and

adapted to coperate with a threaded ring 14, the diaphragm 13 of the receiver being clamped between the threaded ring 14 and the cup 10 inoperative relation to the poles 12 extending through the coils.

The coperating mechanism just described is insulated from the shell 1 by means of tubes 2 and 3 of insulating material, such as vulcanized liber or the like, which effectually prevents contactbetween the metal of the shell and any part of the copera'ting mechanism.

The cap usedto close the larger end of the shell 1 and to secure in position therein the cooperating mechanism consists of a main portion 6 of thin sheet metal formed as indicated and adapted to cooperate with a sepa rate internally threaded ring 5 so formed as to surround the portion 6 and extend into engagement with the threaded portion of the body of the receiver shell to clamp the cap 6 againstts left-hand end. The ring 5 has formed just inside of itsend flange an annular counterbore 5 which is extended a slight distance below the threads formed on the inner sur-face. of the ring 5. The cap 6, which is first formed of an outer diameter slightly smaller than the internal diameter 'of the screw threads in the ring 5, issecured to the ring 5 by nerforat-ing t e edge of the cap 6 at several places around-nts periphery, as indicated at 6L in Fig. 2, and forcing the portion of the cap outside of the perforations into the 4counterbore 5". This serves to lock the ring 5 to the cap 6 so as to prevent their becoming separated, although the nature of the engagement may not be such as to secure them rigidly together. An insulating disk 7 of the fiber or similar material is used to prevent contact between the cooperating mechanism of the receiver and the receiver cap.

Thile I have shown my invention in the particular embodimentherein described, I d o not, however, limit myself to this construction, but'desire to claim broadly any equivalent modification that will suggest itself to those skilled in the art.

lVhat I claim is:

1. A telephone receiver shell consisting of a body portion and a cap, such cap comprising a perforated member conformed to communicate sound waves from the receiver to the ear, and a separate threaded ,ring loosely secured thereto and coperating therewith for engaging the body portion of the receiver shell.

2. A telephone receiver shell consisting 'l of two elements one of which is the body portion of the shell and the other a cap, each of such elements comprising a main member and a separate threaded ring loosely secured thereto and coperating therewith, such rings adapted to engage each other.

3. A telephone receiver shell consisting of eeen/0e two elements one of which is 'the body portion oit the shell and the other a cap, each of suoli elements comprising a main member formed from thin sheet steel, and a threaded ring of other material loosely secured thereto and coperating therewith, such rings adapted to engage each other.

4i. telephone receiver' shell consisting of two parts, each of such parte formed from thin sheet metal, sind a separate threaded ring loosely secured to each part surrounding and coperating with the same, such rings adapted to engage each other.

5. A vtelephone receiver shell consisting of a receiver cap, a body portion, anda sepa rete threaded ring cooperating therewith and adapted to engage the receiver cap, such ringr` secured -to the body portion by coopera-ting projections and yrecesses carried by such parte.

6. A telephone' receiver shell consisting of a body portion and a cap, such cap compris-V ing a perforated member conformed to communicate sound Waves from the receiver to lthe ear, and va separate threaded ring cooperating therewith to engage the body por tion of the receiver shell, such ring secured to the body portion by cooperating projections and recesses carried by such arts.

7. A telephone receiver shell consisting of two elements .one of which isthe body portion of the shell and the other a cap, each of such elements comprisinga main member and a separate threaded ring coperating therewith, such rings adapted to engage each other, each of such rings secured to the oooperating elemerit by cooperating projeo' tions and recesses carried by such parts.

8. A telephone receiver shell consisting of a receiver cap, a body portion formed by punching and drawing from thin sheet metal, and a separate threaded ring cooperating therewith and adapted to engage the receiver cap, such ring having holes formed therein for engaging projections on the body portion to secure the ring to the body portion,

9. A telephone receiver shell consisting of a body portion and a cap,' such cap com pi-ising avperforated member conformed toA con'imiinicnte sound waves 'from the receiver tothe ear, and a separate threaded ring cooperating therewith to engage the body portion of the receiver shell, such ring; having a groove formed therein to engage projections formed on the perforated member to secure the ring to such. member.

ifi-A telephone receiver shell consisting of a body portion and a cap, such cap coinprising a perforated member conformed to communicate sound waves from' the receiver to the ear7 and a seperate threaded ring cooperating therewith to engage the body portion of the receiver shell, sochring having an internal groove formed therein to engage peripheral projections formed on the per 'forated member to secure the ring to siich member. j,

.11..111 a. 4telephone :receiver shellj the come biiiation oi a inain portion expendedinte an enlarged part at one eiid, e. .sepa-retethreaded ring surrounding- Said enlarged part, a'projectionon said ring chgegingvthe edge ofthe enlarged part to reta-in the' ring thereon, and cooperating projections andrecesses in said ring and main portion holding said ring thereon and :i cap engaging said l threads. y

In witness whereof, I hereunto subscribe my naine this 5th day of October A. d). 1908,

' JGHN HALLW. VVit-nesses:

WM. W. DEAN, A. D. T. Liner. 

